Safety-stop for steam-engines.



' S. G. CARR. SAFETY STOP FOR STEAM ENGINES. APPLICATION FILED APR. 23,1911. 1,041,239, Patented Oct. 15, 1912'.

4 SHEETSSHEBT 1.

S. G. GARE.

SAFETY STOP FOR STEAM ENGINES.

APPLICATION FILED APR. 28, 1911 Patented Oct. 15, 1912.

4 SHBETSSHEET 2.

COLUMBIA PLANOQRAPH CO., WASHINGTON. D c.

S. G. CARR.

SAFETY STOP FOR STEAM ENGINES.

APPLICATION FILED APR.28,1911.

1,041,239. Patented Ot. 15, 1912.

J i I H a will illl ll avwe/wto'a S. C. CARR.

SAFETY $TOP FOR STEAM ENGINES. APPLIGATION FILED APR.28,1911.

1,041,239. Patented Oct. 15, 1912.

2 4 SHEETS-SHEET 4.

COLUMBIA PLANOGRAPH c0" WASHINGTON, u. c.

sans raraur orrro.

SELBY C. CARE, OF MUSKOGEE, GKLAI-IOMA.

SAFETY-STOP FGR STEAM-ENGINES.

To all whom it may concern:

Be it known that I, SELBY C. CARR, citizen of the United States,residing at Muskogee, in the county of Muskogee and State of Oklahoma,have invented certain new and useful Improvements in Safety-Stops forSteam-Engines, of which the following is a specification.

This invention relates to a safety stop for steam engines, and aimsprimarily to provide means for automatically cutting off the supply ofsteam to the engine when the engine is subjected to excessive load orwhen there is a tendency for it to race.

The invention also contemplates the cutting oif of steam to the engineupon such injury to the governor as would render the latter inoperative.

It is also an aim of the invention to so construct the safety mechanismthat it may be manually tripped or actuated to cut off the supply ofsteam to the engine without the necessity of operating the throttlevalve, so that should the throttle valve be located in the vicinity ofescaping steam or should it become expanded due to heat so as to bedii'licult to turn, the shutting off of the steam supply may beaccomplished without risk on the part of the engineer.

The invention further aims to provide an automatic cut-off mechanism ofthe type mentioned which may be assembled with any ordinary steam engineand -its governor without any material change in the construction of thegovernor.

It is also an object of the invention to provide for adjustment of themechanism whereby it will be responsive to a predetermined increase inspeed of operation of'the governor, or to a decrease in speed ofoperation of the governor due to excessive load being imposed upon theengine, or due to such breakage of or injury to the governor as wouldrender the latter inoperative.

For a full understanding of the invention reference is to be had to thefollowing description and accompanying drawings, in which:

Figure 1 is a view in elevation of the mechanism embodying the presentinvention, the parts thereof being shown in the positions which theywill occupy when the engine is running under normal speed and loadconditions; Fig. 2 is a similar View, showing the parts in the positionswhich they will assume when the mechanism has Specification of LettersPatent.

Application filed April 28, 1911.

Patented Oct. 15,1912.

Serial No. 623,914.

been tripped due to an abnormal increase in speed of operation of thegovernor; Fig. 3 is a similar view, illustrating the positions of theparts when the mechanism has been tripped due to operation of thegovernor under excessive load conditions; Fig. 4 is a plan view, partsbeing shown in sections, of the mechanism, the parts thereof being inthe positions shown in Fig. 1 of the drawings; Fig. 5 is a detail viewin side elevation of the support for the mechanism; Fig. 6 is a view inside elevation of the mechanism, the parts thereof being in thepositions shown in Fig. l of the drawings; Fig. 7 is a detail view inelevation of a portion of the support for the mechanism; Fig. 8 is aplan view of said support; Fig. 9 is a detail view of the supporting pinfor one of the abutments for the trip mechanism; Fig. 10 is a detailView in side elevation of the rod constituting an element of themechanism arranged to normally hold, against actuation, the lever foractuating the valve controlling mechanism of the engine; Fig. 11 is adetail view of the trip mechanism; Fig. 2 is a detail view of theabutment which cooperates with the arm shown in Fig. 10.

Corresponding and like parts are referred. to in the followingdescription and indicated in all the views of the accompanying drawingsby the same reference characters.

While in the drawings there is shown a specific form of governor,although of a well known type, and a specific valve controllingmechanism, it will be readily under stood that the safety stop mechanismembodying the present invention may be assembled with any other similarform of governor and any other similar form of valve controllingmechanism.

Of the governor, the tubular standard is indicated by the numeral 1, andworking in this standard is the usual rod 2, to the upper end of whichare pivoted the arms 3 carrying at their outer ends the centrifugalballs 4. These arms, in their revolution in different planes, raise orlower the usual sleeve 5 which works upon the rod 2, and this sleeve hasa connection with the mechanism embodying the present invention whichwill be presently explained.

A casting, which constitutes the support for the working elements of themechanism,

includes, in its structure, a sleeve 6 which is secured upon the tubularstandard 1 1n any suitable manner, and a lateral extension '7 which isformed with a bearing 8. A short rock shaft 9 is mounted in the bearing8 and has secured at one end a head 10 in which is adjustably fitted oneend of an arm 11, the arm being held at adjustment by means of a setscrew 12 threaded through the head and bearing against its said end. Aweight 13 is held, by means of a set screw 14, at adjustment upon thearm 11 and is designed to regulate the speed of the engine. For apurpose to be presently explained, the extension 7 of the support isformed at one end of its bearing 8 with a shoulder, which is indicatedby the numeral 15. Loosely mounted upon the shaft immediately outwardlyof that end of the hearing at which the shoulder 15 is formed, is alever 16 having an arm projecting below and an arm projecting above thesaid shaft. The hub of this lever is formed also with a shoulder,indicated by the. numeral 17, which is arranged to cooperate, in amanner to be presently explained, with the shoulder 15 of the saidbearing 8, the rocking movement of the lever in one direction being inthis manner limited. 7

A rock arm 18 is secured by means of a set screw 19 and a taper pin 20to the shaft 9 beside the lever 16 and projects beside the extension 7of the support above described.

' To the free end of this arm is pivoted the lower end of a rod 21 whichat its upper end is connected, as at 22, with the sleeve 5 of thegovernor, it being understood that as the governor is operated underhigh and low speed conditions, the rod 21 in moving up and down willrock the arm 18 and impart rocking movement to the shaft 9. In orderthat the lever 16 may move with the shaft 9 under normal conditions,there is provided a means which will now be described.

A rod 23 is pivoted at its lower end to the lower end of that arm of thelever which projects downwardly from the shaft 9 and this rod is formedwith a slot which is indicated by the numeral 24, and is widened at itsend which is adjacent that end of the rod opposite the end which ispivoted to the lever 16. A block 25 of hardened steel or other suitablematerial is secured in place upon one wall of the widened portion of theslot 24 and forms a shoulder having an abutment which is carried by thearm 18 and is clearly shown in Figs. 1 and 12 of the drawings. Thisabutment is in the form of a pin having a portion 26 fitting loosely inthe outer end of the arm 18 and having a cam portion, indicated ingeneral by the numeral 27, and fitting in the slot 24 in the rod 23. Anut 28 is threaded upon one end of the pin comprising the abutment andprevents disengagement of the rod 23 from the cam portion 27 of the saidabutment. This portion 27 of the said abutment is so formed as to have ashoulder which normally seats against the block 25 in the slot 24,although, when the abutmentis rocked the governor. Such movement of thelever,

however, is prevented by the engagement of the abutment 27 with theblock in the slot 24 of the rod 23. It will be understood, however, thatwhen the abutment is so rocked as todisengage its said shoulder 29 fromthe said block, the spring 30 is permitted to swing the lever 16 toapproximately the position shown in Fig. 2 of the drawings.

As a means for oscillating the abutment to disengage from the block 25,there is pro.

vided a trip which is carried by theabutment and is arranged to engagewith adjustable abutments upon the support when the arm 18 is rockedupwardly or downwardly to an abnormal degree in responding to themovement of the rod 21 when the governor is running under abnormallyhigh speed or under excessive load conditions, and this trip isindicated in the drawings by the numeral 31, and is held upon the end ofthe abutment above described, opposite its threaded end, by means of aset screw 32. The trip 31 is in the form of a block which is soproportioned that its end which is opposite its end which is locatedadjacent to the shaft 9 will be heavier and will consequently tend tofall although it is normally prevented from such movement by reason ofthe engagement of the shoulder 29 of the abutment with the block 25. Thesleeve 6 of the support For the mechanism is formed at its upper endwith an ear 33 through which is adjus'tably threaded an abutment screw34 having its lower end positioned in the path of movement of the minorend of the trip 31.

It may be stated at this point that when the arm 18 is swung upwardly toa predetermined degree due to the upward movement of the rod 21 when thegovernor is operating under excessive speed, the minor end of the tripwill be brought into engagement with the lower end of the abutment screw34 and the trip will then be rocked to about the position shown in Fig.3 of the drawings. This rocking movement of the trip will serve todisengage the shoulder 29 of the abutment from the block 25 and willallow the spring 30 to swing the lower arm of the lever 16 in thedirection of the tubular standard 1 of the governor. Connection betweenthe lever 16 and the valve controlling mechanism, to be presentlydescribed, will then cause the actuation of this mechanism to cut oilthe supply of steam to the engine.

The sleeve 6 of the support is formed at its lower end with a lug whichin turn is formed with a vertically extending bore 36 and with a slothaving an upwardly extending end 37, a downwardly inclined portion 38,and a returned portion 39 which results in a shoulder 40 upon the upperwall of the slot between the portions 38 and39. A pin 41 is rotatablyfitted in the bore 36 in the lug 35 and this pin carries a stud 42 whichprojects into and works in the slot above mentioned. A spring 43 istitted upon the pin 41 within the bore and at its upper end is connectedwith the'head or" the pin, as at 44, and its lower end is insertedthrough an opening in the wall of the bore 36. This spring normallyholds the pin 41 elevated and also normally holds it rotated with thestud 42 seating in the end 01 the portion 38 of the slot in the lug 35.A hand or finger wheel 45 is secured at the lower end of the pin 41 andmay be rotated for the purpose of turning the pin in the bore, duringwhich movement the stud 42 will ride down the inclined portion 38 of theslot and will eventually seat in the portion 39 thereof and behind theshoulder 40, this movement of the pin being against the tension of thespring 43. The head of the pin 41 is formed.

with a laterally projecting portion 46 in? which is adjustably threadedan abutment screw 47 which is normally positioned in the path ofdownward movement of the trip 31, it being understood, however, that bymeans of the hand wheel 45, the pin 41 may be so rotated as to move the,abutment screw 47 out of the path of movement of the trip, in whichposition it is seen in dotted lines in Fig. 4 of the drawings. At thispoint it may be stated that should the governor be operat-ing at lowspeed due to excessive load being imposed upon the engine or due to suchdamage to it as would result in its being rendered inoperative tocontrol the supply of steam to the engine, the arm 18 will be swungdownwardly due to the tripping of the rod 21 and the trip 31 will bebrought into engagement with the upper end of the abutment screw 47.This will result in the trip being moved to the position shown in Fig. 2of the drawings, and in a disengagement of the shoulder 29 from theblock 25 as in the instance of the engagement of the trip with theabutment screw 34. In order to manually reset the lever 16 after itsrelease, there is provided, at the lower end of the lower arm of thesaid lever a handle 48.

While, as before stated, the mechanism embodying the present inventionmay be assembled with any ordinary valve controlling mechanism, thatshown in the drawings includes an arm 49, to which is connected a rod 50which is connected either to the upper or to the lower arm of the lever16, depending upon the relative arrangement of the mechanism of theinvention and the valve controlling mechanism. At this point it will beunderstood that rocking movement imparted to the lever 16 will result incorresponding movement of the arm 49. This arm 49 is formed or providedwith a cam portion 51 which is of course movable therewith. An arm 52 ismounted upon the shaft 53, upon which the arm 49 is also mounted, and isarranged to move the steam valve to cut oil or admit steam to the enginecylinder.

The numeral 54 indicates an arm which carries a cam 55 having a port-ion56 arranged to coiiperate with the cam portion 51 of the arm 49. A rod56 is connected to the arm 52 and at its lower end is preferablyprovided with a piston (not shown) working in a dash pot. The arm 52carries a block 57 which engages with a shoulder 58 upon one member ofthe cam 55 and normally connects the arms 52 and 54 for simultaneousoperation. However, when the arm 49 is swung so as to bring its camportion 51 into engagement with the portion 56 of the cam 55, the saidcam 55 will be so rocked as to bring its shoulder 58 out of engagementwith the block 57 and the arm 52 will then be released and the downwardpull of the rod 56 will result in steam being cut off from the engine.Thus, the movement of the arm 49 controls the movement of the rod 56 andthe admission of steam to the engine cylinder.

From the foregoing it will be readily understood that whether the arm 18is swung upwardly or downwardly due to operation of the governor underabnormal speed or under excessive load conditions, the engagement of thetrip 31 with the adjustable abutments 84 or 4'7 will result in a releaseof the lever 16 and in a movement of this lever, under the action of thespring 30 to so rock the arm 49 of the valve controlling mechanism as torelease the rod 56 of this mechanism and cut oil the supply of steam tothe engine. It will also be understood that subsequent to the release ofthe lever 16 it may be readily reset by means of the handle 48 carriedby its lower arm. t will also be understood that the trip 31 may bemanually actuated either directly or by connecting to its major end acord or like connection extending to a point remote from the engine andits governor. Thus, should the throttle valve of the engine becomeexpanded to such degree as to prevent its ready movement to closedposition, or should steam be escaping in the vicinity of the throttlevalve, the governor, or the valve controlling mechanism, the safetymechanism embodying the present invention may be manually actuated byrocking the trip 31 in the manner stated.

l/Vhen the arm 18 is swung downwardly due to breakage of the governormechanism or due to operation of the governor at an abnormally lowspeed, for example, when the engine is running under excess load, itwill strike the upper end of the pin 41 and will depress this pinagainst the tension of the spring 43, thereby causing the stud 42 toride in the slotin the lug 35 of the support, the trip 31 coming intoengagement, however, with the abutment pin 47 immediately prior to suchturning movement of the pin 41. Thus, when the arm 18 has swungdownwardly to the limit of its movement, it will rest upon the pin 41and will be supported by this pin and not by the abutment pin 47. Thisobviates injury to the pin 47 and its disarrangement from adjustment. Byreferring to Fig. 7 it will be observed that when the pin 41 isdepressed, its head will rest upon the lug 35 and the spring 43 willthus be relieved of compression to such degree as would injure it.

While, as before stated, the invention provides means for automaticallycutting oli' steam from the engine when there is a tendency for theengine to race or when the engine is subjected to excessive load conditions, the invention also provides means whereby the safety mechanismmay be rendered non-respensive to excess load conditions when it isdesired to carry an overload on the engine for a short time, by manuallyoperating such means prior to imposing the overload, and it iscontemplated that this may be accomplished without rendering themechanisms non-responsive to conditions of excessive speed.

The invention also contemplates that the mechanism shall beautomatically rendered responsive to conditions of overload as soon asthe engine has been relieved of the overload, to carry which themechanism was manually tripped. In this respect the operation of themechanism is as follows When the engine is running under normal loadconditions and at a normal speed, the trip 31 will occupy a positionsubstantially as shown in Fig. 1 of the drawings and between theadjustable abutments 34 and 47. Should it become necessary to impose anoverload upon the engine, the hand wheel 45 is manually rotated againstthe tension of the spring 43 thereby rotating the supporting pin 41 andcausing the stud 42 to move down in the slot 38, passing the shoulder 40and entering the returned part of the slot, or more specifically, thenotch 39, the spring of the path of the trip 31. When the overload isfirst imposed upon the engine, the governor will drop in order to admitsteam for a longer period of cut-oil, and bring-the engine to normalconditions. It the overload is great, the arm 18, through the movementof the rod 21, will drop down and rest upon the supporting pin 41,lowering this pin against the tension of the spring 43 and disengagingthe stud 42 from the end 39 of the slot 38, thus causing the laterallyprojecting portion 46 to rest on the cutaway portion of the lug 35 whichat this time bears the weight of the governor. As the engine resumesnormal working condi tions, and speed, the arm 18 will belifted by thegovernor and will move away from the lug 35 and pin 41, the spring 43causing the pin 41 to 'follow the arm 18 in its up As the pin, moves up}ward movement. wardly, the stud 42 will ride around in the slot 48 andthe abutment 47 will be'brought to position in the path of movementotthe trip 31. 7

If for any reason the engine should engage with the abutment 47 and themechanism would automatically cut off the supply of steam to the engine.At this point it will be observed that the hand wheel 45 serves twopurposes. In the first place, it may be manually rotated to move theabutment47 out of the path of movement ofthe trip in order to preventthe safety mechanism being operated when it is deslred to carry a heavyload on the engme for a short tune,

the abutment pin 47 being automatically brought into the path ofmovement ofthe V subjected to a second overload, the trip will trip 31when the engine is relieved of its I overload. In the second instance,the handwheel may be manually rotated to swing the abutment 47 out ofthe path of movement of the trip 31 when shutting down the engine, thusrendering it unnecessary to reset the trip on again starting the engine,abutment 47 being automatically brought into the path of movement of thetrip, above described, when the engine is again started. It will at thispoint be understood that by adjusting the screws 34 and 47 the mechanismmay be adapted to shut down the engine under any speed or loadconditions desired, within the speed range and load capacity of theengine.

The automatic operation of the mechanism is as follows :When the speedof the engine is greater than that for which the abutment pin 34 is set,the minor end of the trip. 31

strikes this pin, thereby rotating the abutment 26 in the arm 18 anddisengaging the shoulder 29 of the abutment from the shoulder in theslot in the rod 23. The spring 30 will then act to throw the lever 16 ina direction to prevent steam from being admitted to the engine,connection being made to the valve,-gear by the rods 50.. Movement ofthese rods serves to rotate the arm 19 carrying the block 51 until theend 56 of the cam rides upon the block 51 during its complete circularmovement. This engagement of the cam 55 with the block 51 serves to holdthe shoulder 58 out of position to en gage the arm 57, and no steambeing admitted to the cylinder, the engine will cease to run. As theengine slows down, the arm 18 will drop and rest upon pin 41, the weightof the governor rotating the pin and throwing the adjustable abutment 47out of the path of movement of the trip 31 so that the trip may be resetbefore starting the engine. By providing the shoulder 15 on the bearing8, coiiperating with the shoulder 17 on the hub of the lever 16, thelever 16 is prevented from throwing the arm 49 past a position toprevent steam from being admitted to the cylinder of the engine when thesafety mechanism is actuated. At this point it may be stated that thearm 49 and the lever 16 would be moved considerably farther from theperpendicular when the safety mechanism operates due to excessive speed,than they would when the mechanism is operated under excessive loadconditions, due to the fact that the governor, through the lever 16 androds 50, would have rotated the arm 49 toward cut-off position prior tothe tripping of the safety mechanism under excessive speed conditions.Owing to the provision of the shoulders upon the lever and bearing,however, the ends of the lever are not thrown through as great adistance when the trip is operated under excessive speed conditions aswhen it is operated under excessive load conditions, yet the leverassumes the same position in both instances. This is due to the factthat the governor has moved the lever 16, under excessive speedconditions, to a position other than that to which it moves the leverunder excessive load conditions, prior to the operation of the tripunder excessive speed or excessive load conditions.

Another purpose of the shoulders on the lever and its bearing is toprevent the shoulder 29 of the cam 27 from striking the lower end of theslot in the rod 23, which would result in battering of the shoulder.When the trip is brought into engagement with the abutment Set, the camwill be rocked to dis engage its shoulder 29 from the shoulder in theslot in the arm 23, and abutment 27 may then move down in the slot inthe said rod until the arm 18 is resting on the supporting pin 11, atwhich time the shoulder, 29 of the abutment 27 is near the lower end ofthe slot in said rod but does not engage against the same. It will beobserved from an inspection of Fig. 12 of the drawings that the abutment27 is formed with two of the shoulders 29, and may be reversed wheneither one of the shoulders becomes worn. When the load on the enginebecomes greater than that for which the abutment 4:7 is set, the arm 18drops down bringing the trip 31 into engagement with the said abutment.This engagement of the trip with the abutment 47 serves to disengage theshoulder 29 from the shoulder in the slot in the rod 23, at which timethe trip will assume about the position shown in Fig. 2 of the drawings.The spring 30 will then throw the lever 16 to position to cut oil thesupply of steam to the engine cylinder, and will also move the rod 23 toabout the position also shown in Fig. 2 of the drawings. The arm 18continues to drop, strikes upon the upper end of the pin 41 anddepresses this pin against the tension of the spring 43. the stud 42riding down in the slot 38, as before described. The stud 42 does not,however, enter the notch 39. This movement of the pin 11 throws theabutment t'i'out of the path of movement of the trip 31 and allows themechanism to be reset before the engine is again started. Due to thefact that the major end of the trip 31 strikes the adjustable abutment47 before the lever 18 strikes the upper end of the pin t1, it followsthat when the mechanism is reset, the major end of the trip 31 will belower than the top of the abutment 17, and hence it will be seen that itis necessary that the abutment 4-? should be rotated out of the path ofmovement of the trip 31 in order to permit of resetting of the mechanismafter tripping. At this point it, may be remarked that the trip 31 isheavier at one end than at the other for the purpose of causingengagement of the shoulder 29 of the abutment 27 with the shoulder inthe slot in the rod 23 when reset-ting the mechanism. At this point itwill also be understood that in order to trip the mechanism manually itis only necessary to rock the trip until the shoulder 29 is disengagedfrom the shoulder in the slot 24 in the arm 23.

It is preferable that the block 25 be in the form of square and held inplace by a centrally located screw. so that its four edges may besuccessively presented to the shoulder 29 of the abutment 27 as theybecome worn through use.

It is to be understood that in place of the hand wheel 45, a short handlever may be used and, if desired, a buffer of hard wood or soft metalmay be arranged between the striking points of the shoulders on thelever 16 and its bearing 8 to absorb the shock when the shoulder on thelever strikes the shoulder on the bearing. In fact, the elements of themechanism may be re-arranged in numerous ways without departing from thespirit of the invention.

A support (50 is preferably cast integral with the sleeve 6 and supportsa dash-pot 61 provided in connection with the governor.

Having thus described the invention, what is claimed as new is:

1. In mechanism of the class described, the combination with the movableelementof a governor, a rock member connected with the said element ofthe governor, a valve controlling lever movable independently of therock-member, means tending to move the lever to cut-otl' position, anarm pivoted to the lever and formed .with a shoulder, a trip pivoted tothe rock-member, a reversible abutment movable with the trip andnormally engaging with the shoulder upon the said rod whereby to holdthe lever against such movement, and means for actuating said trip uponabnormal movement of the said rock arm to disengage said abutment fromsaid shoulder.

2. In mechanism of the class described, the combination with the movableelement of a governor, of a rock member connected with the said elementof the governor, a valve controlling lever movable independently ot' therock-member, means tending to move the lever to cut-oii' position, a rodpivoted to the lever and provided with a slot having a shouldered wall,a trip pivoted to the rock-member, an abutment movable with the trip andnormally engaging the shoulder of the said rod whereby'to' hold thelever against such movement, an adjustable means for actuating said tripupon abnormal movement of the said rock-member whereby to disengage saidabutment from said shoulder.

3. In mechanism of the class described, the combination with the movableelement of a governor, of a rock-arm'connected with the said. element ofthe governor, a valve controlling lever movable independently of therock arm, means tending to move the lever to cut-ofi" position, a rodpivoted to the lever and provided with a shoulder, a trip pivoted to therock-arm, an abutment movable with the trip and normally engaging theshoulder upon said rod whereby to hold the lever against such movement,and adjustable means for actuating said trip movement of the rock-armresponsive to abnormal increase in speed of said governor whereby todisengage said abutment from said shoulder.

4:. In mechanism of the class described, the combination with themovable element of a governor, of a rock-member connected with saidelement of the governor, a valve controlling lever movable independentlyof the rock-member, means tending to move the in speed of the governorwhereby to disen gage said abutment from said shoulder.

5. in mechanism of the class descrlbed,

the combination with the movable element of a governor, of a rock-memberconnected with the said element of the governor, a valve controllinglever movable independently of the rock-member, means tending to movethe lever to cut-cit position, a rod pivoted to the lever and formedwith a slot having a shouldered wall, a trip pivoted to the arm andmovable therewith, an abutment carried by the trip and normally engaging with said shoulder whereby to hold the lever against suchmovement, an abutment arranged to engage with the trip upon movement ofthe arm responsive to abnormally high speed movement of the gov eri'iorwhereby to disengage said abutment from said shoulder, and an abutmentarranged to engage with said trip upon movement of the arm responsive tomovement of the governor under abnormal load whereby to disengage saidabutment from said shoulder.

6. In mechanism of the class described, the combination with the movableelement of a governor, of a rock member connected with said element ofthe governor, a valve controlling lever movable independently of therock member, means tending to move the lever to cut off position, a rodpivoted to the lever and provided with a shoulder, a trip carried by themember, an abutment movable with the trip and normally engaging withsaid shoulder to hold the lever against such movement, means arranged toactuate said trip upon movement of the member responsive to theoperation of the governor under excessive load whereby to disengage saidabutment from said shoulder, and

means arranged also for engagement by said trip to move the latter meansout of such engagement.

7. In mechanism of the class described, the combination with the movableelement of a governor, of a rock member connected with said element ofthe governor, a valve controlling lever movable independently of therock-member, means tending to move the lever to cut oit position, a rodpivoted to the lever and formed with a slot having a shouldered wall, atrip mounted to rock upon the rock member, a reversible abutment movablewith the trip and normally engaging with said shoulder upon the rodwhereby to hold the lever against such movement, the said abutment beingarranged to move in said slot upon disengagement of the abutmentfrom theshoulder, and means arranged to engage with said trip whereby to sodisengage the abutment upon movementot the member responsive toabnormally high speed andexcessive load afli'ecting the governor.

8. In mechanism of the class described, the combination with the movableelement of a governor, of a rock member connected with said movableelement of the governor, a valve controlling lever movable independently01 the said member, means tending to move the lever to cut-ofi position,a rod pivoted to the lever, a trip arranged to rock upon the member, anabutment movable with the trip and normally engaging with the rodwhereby to hold the lever against such movement, an adjustable abutmentar ranged to engage with said trip upon movement of the said memberresponsive to operation of the governor under excessive load conditionswhereby to release said rod and permit of such movement of the lever,and manually operable means for moving said adjustable abutment out ofthe path of movement of said trip. p

9. In mechanism of the class described, the combination with the movableelement of a governor, of a rock member connected 7 whereby to hold thelever against such movement, an adjustable abutment, a movable supportfor said abutment, means normally holding the support to position theadjustable abutment in the pat-l1 of movement of the trip when moved bysaid member responsive to operation of the governor under abnormal speedconditions, and means op erable to move said support to position thesaid adjustable abut ent out of the path of movement of the said trip.

10. In mechanism of the class described, the combination with themovable element of a governor, of a rock-arm connected with the elementof the governor, a support for the rock arm, a valve controlling levermovable independently of the rock arm and mounted upon said support,connection between said support, means tending to move the lever tocut-off position, a rod pivoted to the lever and provided with ashoulder, a trip mounted to rock upon said arm, an abutment movable withthe trip and normally engaging with the shoulder upon the rod whereby tohold the lever against such movement, and oppositely arranged abutmentsupon said support adapted to engage with the trip upon movement of thearm responsive to operation of the governor under excessive loadandabnormal speed conditions whereby disengage said abutment from saidshoulder and permit of said movement oi the lever.

11. In mechanism of the class described, the combination with themovable element of a governor, of a member connected with the saidelement of the rock governor, a valve controlling lever movableindependently of the rock member, means tending to move the lever tocut-oil position, a rod pivoted to the lever and provided with ashoulder, a trip mounted to rock upon said rock member, an abutmentmovable with the trip and normally engaging the said shoulder whereby tohold the lever against such movement, a spring-rotated pin mounted inthe path of movement of said rock member, and an abutment carried by thepin and normally held thereby in the path of movement of the trip whenmovedby said rock member responsive to abnormal load conditionsafiecting the governor, the said pin being rotatable against the tensionof the spring to move the abutment carried thereby out of the path ofmovement of said trip.

12. In mechanism of the class described, the combination with themovable element of a governor, of a rock-member connected with the saidelement of the governor, a valve controlling lever movable independentlyof the rock member, means tending to move the lever to cut-off position,a rod pivoted to the lever and formed with a shoulder, a trip mounted torock upon said member, an abutment movable with the trip and normallyengaging the said shoulder whereby to hold the lever against suchmovement, a spring-rotated pin mounted in the path of movement of saidmember, and an abutment carried by the pin normally held thereby in thepath of movement of the trip when moved by said rook member responsiveto abnormal load conditions, the said pin being rotatable against thetension of the spring to move the abutment carried thereby out of thepath of movement of said trip and means arranged to hold the pin whenrotated to such position.

13. In mechanism of the class described,

- the combination with the movable element of a governor, of a support,a rock arm mounted 011 said support and connected with said element ofthe governor, a valve controlling lever mounted upon the support andmovable independently of the rock arm, means tending to move the leverto cut-off position, a rod pivoted to the lever and formed with ashoulder, a trip pivoted to the rock arm, an abutment movable wit-h the&

trip and normally engaging with the shoulder upon said rod whereby tohold the lever against such movement, the said support being formed witha lug having a slot, a pin rotatably mounted in the lug and having astud working in the slot, a spring normally holding the pin rotated inone direction, an abutment carried by the pin and normally supported inthe path of movement of the trip when moved. by the rock arm responsiveto operation of the governor under abnormal load conditions, and meansmanually operable to rotate said pin to position the abutment carriedthereby out of the path of movement of said trip, the slot in the saidlug having a wall formed with a shoulder engageable by the stud upon thepin whereby to hold the latter against backward rotation after beingpositioned.

14. In mechanism of the class described, the combination with themovable element of a governor, of a rock member connected with the saidelement of the governor, a valve controlling lever movable independentlyof the rock member, means tending to move the lever to cut-oii position,a rod pivoted to the lever and formed with a shoulder, a trip mounted torock upon said rock member, a reversible abutment movable with the tripand normally engaging with the shoulder on the rod whereby to hold thelever against such movement, and oppositely arranged abutmentspositioned to cooperate with the trip.

15. In mechanism of the class described, the combination with themovable element of a governor, of a rock member connected with the saidelement of the governor, a support for the rock member, a valvecontrolling lever movable independently of the rock member, a rodpivoted to the lever and provided with a shoulder, a trip pivoted. tothe rock member, an abutment movable wit-h the trip and normallyengaging the shoulder upon said rod whereby to hold the lever againstsuch movement, and means for limiting the movement of the lever tocut-off position.

16. In mechanism of the class described,

the combination with the movable element of a governor, of a support, arock-member mounted upon said support and connected with said element ofthe governor, a valve controlling lever movable independently of therock-member, means tending to move the lever to cut-off position, a rodpivoted to the lever and formed with a shoulder, a trip pivoted to therock-member and an abutment movable with the trip and normally engagingwith the shoulder upon said rod whereby to hold the lever against suchmovement, a pin mounted in the path of movement of the said rock-member,a spring normally holding the pin elevated and rotated in one direction,an abutment carried by the pin and normally held thereby in the path ofmovement of the trip when moved by said rock-member responsive toabnormal load conditions affecting the governor, said pin beingrotatable against the tension of the spring to position the abutment outof the path of movement-"of the trip, and means for holding the pin insuch position, the pin being arranged to be depressed by the engagementof the rock-member therewith and through its depression to be releasedfrom the holding means whereby to provide tor automatic return of thepin to normal position and with the abutment located in the path ofmovement of the trip upon the upward movement of the rock-member.

17. In mechanism of the class described, the combination with themovable element of a governor, of a support, a rock-member mounted uponsaid support and connected with said element of the governor, a valve byto hold said lever against such movement,

a pin mounted in the path of movement of said rock-member, an abutmentcarried by the pin, a spring connected with the pin and normally holdingthe same in elevated position and rotated to position the abutment inthe path of movement of the trip when moved by said rock-memberresponsive to abnormal load conditions affecting the governor, the pinbeing arranged to be lowered and rotated against the tension of thespring whereby to position the abutment out of the path of movement ofthe trip, and means'for holding the pin when so lowered and rotated, thepin being arranged to be depressed by the rock-member upon theoccurrence of abnormal load conditions and through such depression to bereleased from said holding means whereby to permit the spring toautomatically return the pin to normal position withthe abutment in thepath of movement of the trip upon the upward movement of the rockmember. I

18. In mechanism of the class described, the combination with themovable element of a governor, of a rock member connected with the saidelement of the governor, a valve controlling lever movable independentlyof the rock member, means tending to move the lever to cut-off position,a trip pivoted to the said rock member, means connected with the leverand with the rock member normally holding the former against suchmovement, a rod pivoted to the lever and formed with a slot, arectangular abutment block secured upon one wall of the slot andreversible, and an abutment carried by the trip and having a shouldernormally engaging with the abutment block.

19. .[n mechanism of the class described, the combination with themovable element of a governor, of a rock member connected with the saidelement of the governor, a valve controlling lever movable independentlyof the rock member, means tending to move the lever to cut-0ft position,a rod pivoted to the lever and formed with a shoulder, a trip mounted torock upon said rock member, an abutment movable with the trip andnormally engaging with the shoulder upon the rod whereby to hold thelever against such movement and oppositely arranged abutment screwsadjustable to engage the trip to actuate the same at various speed orload conditions affecting the governor.

20. In mechanism of the class described, the combination with themovable element of a governor, of a rock member connected with saidelement of the governor, a support upon said rock member, a valvecontrolling lever movable independently of the rock member, an armpivoted to the lever and formed with a slot having a shouldered wall, atrip pivoted to the said rock member, an abutment movable with the tripand n0rmally engaging the shoulder of the said rod, means arranged toactuate the trip upon movement of the rock arm responsive to abnormalincrease or decrease of the governor whereby to disengage said abutmentfrom said shoulder, and means arranged to move the lever to cut-offposition upon abnormal movement of said rock member responsive to excessspeed and excess load conditions affecting the governor.

In testimony whereof, I atIiX my signature in presence of two witnesses.

SELBY C. CARR. [L. s] Witnesses:

W. H. STETLER, J. S. WEATHERS.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents, Washington, D. G.

